Mark A G Brantley is an Attorney by profession. He is the Managing Partner of the prestigious law firm Daniel, Brantley & Associates, the largest law firm in St. Kitts and Nevis. He was educated at the University of West Indies, the Norman Manley Law School and the University of Oxford.

Mr. Brantley has been a Senator in the Nevis Island Assembly for the Concerned Citizens Movement from July 2006 to present. He is also the Leader of the Opposition in the National Parliament having been elected by the people of St. Johns and St. Pauls (District 9) on 27th August 2007. He has been married for 14 years and has 2 daughters.